Coherent oscillations in small Fermi-polaron systems

Year: 2017

Authors: Tylutki M., Astrakharchik GE., Recati A.

Autors Affiliation: Univ Trento, BEC Ctr, INO CNR, I-38123 Povo, Italy; Univ Trento, Dipartimento Fis, I-38123 Povo, Italy; Aalto Univ, Dept Appl Phys, COMP Ctr Excellence, Aalto 00076, Finland; Univ Politecn Cataluna, Dept Fis, ES-08034 Barcelona, Spain; Ludwig Maximilians Univ Munchen, D-80333 Munich, Germany.

Abstract: We study the ground state and excitations of a one-dimensional trapped polarized Fermi gas interacting with a single impurity. First, we study the tunneling dynamics of the impurity through a potential barrier, such as one effectively created by a double-well trap. To this end, we perform an exact diagonalization of the full few-body Hamiltonian and analyze the results in a local-density approximation. Off-diagonal and one-particle correlation matrices are studied and are shown to be useful for discerning between different symmetries of the states. Second, we consider a radio-frequency spectroscopy of our system and the resulting spectral function. These calculations can motivate future experiments, which can provide further insight into the physics of a Fermi polaron.

Journal/Review: PHYSICAL REVIEW A

Volume: 96 (6)      Pages from: 063603-1  to: 063603-9

More Information: We are grateful to L. P. Pitaevskii, A. G. Volosniev, S. Jochim, T. Sowinski, and D. Pecak for stimulating discussions. This work was supported by the Provincia Autonoma di Trento. During the final stage of manuscript preparation M. T. was also supported by ERC Advanced Grant “Condensation in Designed Systems” No. 675013. G.E.A. acknowledges partial financial support from the MICINN (Spain) Grant No. FIS2014-56257-C2-1-P. The Barcelona Supercomputing Center (Centro Nacional de Supercomputacion) is acknowledged for the provided computational facilities.
KeyWords: Polaron physics, Strongly Interacting Fermi gasess, Few Body Physics
DOI: 10.1103/PhysRevA.96.063603

Citations: 21
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